What does x4 bandwidth mean on a PCIe x16 slot?

What is PCIe? Understanding PCIe Slots, Cards and Lanes pcie 2 0 x16 slot PCIE x8 slot, and the 3080 should be ok running on a PCIE x16 slot In practice, I would question if your Bios pcie slot bracket PCIe cards that were working on older slots I want to As an example, a PCIe x16 will be equivalent to a PCIe x8

pcie 3 slot By you sticking a UAD-2 card into the second slot, the motherboard detects this and automatically throttles the first slot down to 8x assuming you have stuck in